Im with you mate i wouldnt be able to put a healthy dog down,i think you would be best of finding pet homes for dogs that dont make the grade as early as poss i now this is no easy task though and very time consuming
I couldnt put a healthy dog down especialy after owning for 7 years it would be like killing one of my mates i would have known along time ago the dog was not up for the job and found it a nice pet home